CN214457146U

CN214457146U - Buried small and miniature sewage treatment device

Info

Publication number: CN214457146U
Application number: CN202120333425.XU
Authority: CN
Inventors: 王卓; 宋剑锋; 于传鹏; 王冬艳; 刘菲
Original assignee: Liaoning Beifang Environmental Protection Co ltd; Liaoning Environmental Protection Group Co ltd
Current assignee: Liaoning Beifang Environmental Protection Co ltd; Liaoning Environmental Protection Group Co ltd
Priority date: 2021-02-05
Filing date: 2021-02-05
Publication date: 2021-10-22
Anticipated expiration: 2031-02-05

Abstract

A buried miniature sewage treatment device belongs to the technical field of sewage treatment. The sludge-lifting pipe is supported at the bottom of the tank body, the upper part of the sludge-lifting pipe is provided with a sludge through hole, the lower part of the sludge through hole is provided with a mixing groove along the circumference of the sludge-lifting pipe, a deflection cylinder is sleeved at the periphery of the sludge-lifting pipe, and a plurality of water outlet holes are formed along the circumference close to the bottom of the deflection cylinder; the combined filler is filled between the deflection cylinder and the sludge lifting pipe, the overflow groove is arranged on the periphery of the upper part of the deflection cylinder and annularly arranged along the inner wall of the tank body, one end of the aeration pipe is arranged at the bottom of the sludge lifting pipe, the other end of the aeration pipe is connected with the air inlet pipe, the sludge discharge pipe is communicated with the sludge outlet end of the deflection cylinder, and the bottom of the sludge discharge pipe is connected with the air inlet pipe through the air stripping pipe; regulating valves are respectively arranged on the aeration pipe and the gas stripping pipe, and sewage treatment or sludge discharge is respectively carried out by controlling the two regulating valves to be alternately switched on and off; the tank body is provided with a water inlet pipe communicated with the mixing groove and a water outlet pipe communicated with the overflow groove. The invention has compact structure, combines anaerobic, facultative and aerobic processes, has smooth process connection and high reaction efficiency.

Description

Buried small and miniature sewage treatment device

Technical Field

The invention belongs to the technical field of sewage treatment, and particularly relates to a buried miniature sewage treatment device which is suitable for rural distributed domestic sewage treatment.

Background

Japan is one of the earliest countries in which distributed integrated sewage treatment apparatuses were studied, and the integrated sewage apparatuses are called septic tank technologies in japan, which play an important role in treating distributed domestic sewage in japan to achieve the environmental protection goal. The Japanese purification tank mainly takes contact oxidation and MBR as technical core, the popularization rate in Japan exceeds 90 percent, the product is in the form of a horizontal reactor, the serialization is complete, the single set of treatment capacity is 1-100 m3/d, the application range is wider, but the cost of main equipment of a small-scale system is as high as nearly 2 ten thousand yuan/t water due to higher price.

In recent years, the development of rural decentralized sewage treatment industry in China is fast, but the technology is relatively deficient, the small decentralized treatment process applied to the market is basically a reduced version of centralized treatment, such as small A2/O, contact oxidation, MBR and the like, China has no relevant industry and national standard, the industry is low in admittance, products are often designed roughly and simply, in order to pursue an integration effect, the phenomena of equipment sacrifice of a functional area, rough backflow and the like are common, the organic matter removal effect is poor, the denitrification rate is low, the small decentralized sewage treatment process is particularly reflected more obviously on small-scale treatment equipment, and therefore the utilization rate of the rural small decentralized sewage treatment device built in the national range is generally low.

With the rapid development of the membrane industry, more and more enterprises in China in the decentralized sewage treatment industry put forward sewage treatment devices with MBR (membrane bioreactor) process as a core, the monomer treatment capacity is basically 5-300 m3/d, and the MBR process is suitable for centralized treatment in villages and towns or villages and towns, but the MBR process has high one-time investment and treatment cost, the construction cost of conventional ton water is about 5000-10000 yuan/t, the direct treatment cost of ton water treatment is about more than 0.6 yuan/t, and particularly in cold areas in the north, an integrated MBR reactor for ensuring more and more membrane treatment effects is matched with a heat-preservation equipment room in engineering practice, so that the construction cost is further increased.

In cold areas in the north of China, land is wide, residents are scattered, the construction difficulty of a collecting pipe network is high, the temperature is long, the economic level is relatively low, professional technicians are deficient, the research and development investment is low, the starting is fast, the operation effect is stable, the operation cost is low, and the management and maintenance are simple.

Disclosure of Invention

Aiming at the technical problems, the buried small and miniature sewage treatment device is provided.

The purpose of the invention is realized by the following technical scheme:

the invention relates to a buried small and miniature sewage treatment device, which comprises a tank body, a sludge lifting pipe, a deflection cylinder, a mixing tank, an overflow tank and combined fillers, wherein the sludge lifting pipe, the deflection cylinder, the mixing tank, the overflow tank and the combined fillers are arranged in the tank body; the sludge discharge device comprises a baffling cylinder, a sludge lifting pipe, an overflow groove, a sludge discharge pipe and a sludge discharge pipe, wherein suspended combined filler is filled between the baffling cylinder and the sludge lifting pipe; the aeration pipe and the gas stripping pipe are respectively provided with an adjusting valve, and sewage treatment or sludge discharge is respectively carried out by controlling the two adjusting valves to be alternately switched on and off; the tank body is provided with a water inlet pipe communicated with the mixing groove and a water outlet pipe communicated with the overflow groove.

Preferably, the upper part of the mud lifting pipe is further provided with an adjusting mechanism for adjusting the size of the sludge through holes, the adjusting mechanism comprises a movable sleeve, an adjusting bolt, two internal thread components and fixing plates, the movable sleeve is matched with the mud lifting pipe and sleeved on the periphery of the mud lifting pipe, the two fixing plates are symmetrically arranged at the top of the mud lifting pipe along the inner wall, the two internal thread components are symmetrically arranged on the movable sleeve corresponding to the fixing plates, the adjusting bolt is installed in the internal thread components, the end part of the adjusting bolt is in contact with the fixing plates, and the movable sleeve is adjusted to move up and down along the mud lifting pipe by screwing the adjusting bolt so as to adjust the size of the sludge through holes.

Preferably, the sludge passing holes are a plurality of axial strip-shaped holes formed on the circumference of the upper part of the sludge lifting pipe.

Preferably, the mixing chute is a cylindrical structure with a bottom plate provided with an opening matched with the outer diameter of the mud lifting pipe, and the mixing chute is sleeved below the mud through hole in the mud lifting pipe through the opening and is connected with the mud lifting pipe into an integral structure.

Preferably, the bottom of the deflection cylinder is provided with two rows of water outlet holes, the distance between the upper row of holes and the lower row of holes is 150 mm-200 mm, and the distance between the upper row of holes and the lower row of holes and the bottom edge of the deflection cylinder is 100 mm-150 mm.

Preferably, the cross section of the overflow groove is of an L-shaped structure, the short edge end of the overflow groove is connected to the inner wall of the tank body, and the long edge end of the overflow groove is uniformly provided with V-shaped grooves along the circumference.

Preferably, a conical guide cone is further arranged below the mud lifting pipe at the bottom of the tank body.

Preferably, the bottom of a sludge discharge pipe arranged in the tank body is arranged at the upper part of the flow guide cone, and the height from the bottom of the tank body is 50-80 mm.

Preferably, the upper part of the tank body is cylindrical, the bottom of the tank body is in an inverted cone frustum shape, the top of the tank body is provided with a cover plate, and the cover plate is provided with a manhole and a manhole cover.

Preferably, the tank body, the tank cover and the flow guide cone, the mud lifting pipe, the movable sleeve, the flow deflection cylinder, the mixing groove and the overflow groove in the tank body are all made of PE or glass fiber reinforced plastic materials.

The invention has the beneficial effects that:

1. the invention relates to a buried small and miniature sewage treatment device, which is characterized in that a sludge lifting pipe is arranged in a tank body, the top of the sludge lifting pipe is inserted with a regulating mechanism of a sludge through hole, a mixing tank is arranged below the sludge through hole of the sludge lifting pipe, an aeration pipe is arranged in the sludge lifting pipe, a deflection cylinder is arranged outside the sludge lifting pipe, combined filler is arranged between the deflection cylinder and the sludge lifting pipe, an overflow tank is annularly arranged along the tank body at the upper part of the tank body, a sludge discharge pipe is arranged in the tank body and is connected with an air stripping pipe, the aeration pipe and the air stripping pipe are both connected with an air inlet pipe, and the tank body is respectively provided with an water inlet pipe and a water outlet pipe. The whole system has compact structure, combines anaerobic, facultative and aerobic processes, has smooth process connection, no reaction dead zone, high reaction efficiency, low operation cost and simple maintenance.

2. The sludge through holes formed in the sludge lifting pipe are axial strip-shaped holes, and the size of the holes is adjusted through the adjusting mechanism, so that the sludge circulation area is adjusted. The adjusting mechanism is characterized in that two fixing plates are symmetrically arranged at the top of the mud lifting pipe, two internal thread components are arranged on the movable sleeve, the movable sleeve is inserted at the periphery of the mud lifting pipe, the end of the internal thread component is screwed in and arranged on the fixing plates through an adjusting bolt, and the adjusting bolt is screwed in and out to drive the movable sleeve to move up and down at the groove-shaped hole part of the mud lifting pipe, so that the flow area of the axial strip-shaped hole is adjusted.

3. The aeration pipe of the invention aerates in the mud lifting pipe, the rising gas carries the mud to move upwards to mix with the water in the mixing groove, enters the reaction area of the filling area after overflowing and then is baffled to the outside of the baffling cylinder, and then flows to the overflow groove from bottom to top and then is discharged from the water outlet pipe, the whole system prolongs the reaction time to the maximum extent in the limited space, and the reaction efficiency of the whole device is improved.

4. The bottom of the deflection cylinder is provided with two rows of water outlet holes, the flow speed of mud and water which descend in the filling area descends at the water outlet holes, the mud and the water are separated, the sludge continues to settle, and the sewage is deflected and ascends.

5. The cross section of the overflow groove is of an L-shaped structure, the short edge end of the overflow groove is connected to the inner wall of the tank body, and the long edge end of the overflow groove is uniformly provided with V-shaped grooves along the circumference, so that sewage can easily flow back to the deflection cylinder and flow to the overflow groove from bottom to top, and is discharged from the water outlet pipe through the overflow groove.

6. The upper part of the tank body is cylindrical, and the side surface has strong pressure resistance; the bottom is in the shape of an inverted cone frustum, so that the concentrated sedimentation of sludge at the bottom is ensured in the aspect of operation effect, and the sludge backflow amount is ensured.

7. The tank body, the tank cover and the flow guide cone, the mud lifting pipe, the movable sleeve, the flow deflection cylinder, the mixing groove and the overflow groove in the tank body are all made of PE or glass fiber reinforced plastic materials; the manufacturing cost is low, the corrosion resistance is strong, and the installation is convenient.

Drawings

Fig. 1 is a schematic partial sectional perspective view of the present invention.

Fig. 2 is a partially sectional perspective view of another angle of fig. 1.

Fig. 3 is a schematic structural view of the mud-lifting pipe and the mixing trough in fig. 1.

Fig. 4 is a schematic structural view of the movable sleeve in fig. 3.

In the figure: 1. the sludge treatment device comprises an adjusting bolt, 2 parts of a movable sleeve, 3 parts of an aeration pipe, 4 parts of a water inlet pipe, 5 parts of an adjusting valve I, 6 parts of a locking bolt I, 7 parts of an air inlet pipe, 8 parts of an overflow tank, 9 parts of an adjusting valve II, 10 parts of a support plate I, 11 parts of an air stripping pipe, 12 parts of a combined filler, 13 parts of a sludge discharge pipe, 14 parts of a tank body, 15 parts of a deflection cylinder, 16 parts of a guide cone, 17 parts of a support plate II, 18 parts of a mixing tank, 19 parts of a water outlet pipe, 20 parts of a cover plate, 21 parts of a man-hole diameter, 22 parts of a locking bolt II, 23 parts of a man-hole cover, 24 parts of a sludge lifting pipe, 25 parts of a fixing plate, 26 parts of an internal thread component, 27 parts of a sludge through hole and 28 parts of a water outlet hole.

Detailed Description

The invention is described in detail below with reference to the figures and examples.

Example (b): as shown in fig. 1 and 2, the buried small and miniature sewage treatment device of the present invention comprises a tank body 14, a sludge lifting pipe 24 arranged in the tank body 14, a baffling cylinder 15, a flow mixing tank 18, an overflow tank 8 and a combined filler 12, wherein the lower part of the sludge lifting pipe 24 is supported at the bottom of the tank body 14 through a support plate ii 17, a plurality of sludge passing holes 27 are formed along the circumference of the upper part of the sludge lifting pipe 24, the flow mixing tank 18 is arranged at the lower part of the sludge passing holes 7 along the circumference of the sludge lifting pipe 24, the baffling cylinder 15 is sleeved at the periphery of the sludge lifting pipe 24 and supported on the inner wall of the tank body 14 through a support plate i 10, and a plurality of water outlet holes 28 are formed along the circumference near the bottom of the baffling cylinder 15; the suspended combined filler 12 is filled between the deflection cylinder 15 and the sludge lifting pipe 24, the overflow groove 8 is arranged on the periphery of the upper part of the deflection cylinder 15 and annularly arranged along the inner wall of the upper part of the tank body 14, the aeration pipe 3 is arranged in the sludge lifting pipe 24, one end of the aeration pipe 3 is arranged at the bottom of the sludge lifting pipe 24, the other end of the aeration pipe is connected with the air inlet pipe 7, the sludge discharge pipe 13 communicated with the sludge outlet end of the deflection cylinder 15 is arranged in the tank body 14, the bottom of the sludge discharge pipe 13 is connected with the air outlet end of the air stripping pipe 11, and the air inlet end of the air stripping pipe 11 is connected with the air inlet pipe 7; the aeration pipe 3 and the gas stripping pipe 11 are respectively provided with an adjusting valve, in the embodiment, the aeration pipe 3 is provided with an adjusting valve I5, the gas stripping pipe 11 is provided with an adjusting valve II 9, and sewage treatment or sludge discharge is respectively carried out by controlling the two adjusting valves to be alternately switched on and off; the tank body 14 is provided with a water inlet pipe 4 communicated with the mixing groove 18 and a water outlet pipe 19 communicated with the overflow groove 8. When sewage treatment is carried out, the regulating valve I5 is opened, the regulating valve II 9 is closed, gas enters through the air inlet pipe 7 and is discharged from the bottom of the sludge lifting pipe 24 through the aeration pipe 3, the gas rises along the sludge lifting pipe 24 to drive the sludge settled at the bottom of the tank body 14 to rise, the rising sludge enters the mixing tank 18 through the sludge through hole 27 on the sludge lifting pipe 24, and overflows to the baffling cylinder 15 after being mixed with the sewage entering from the water inlet pipe 4, and flows downwards in the baffling cylinder 15 to be in contact reaction with the combined filler 12, the flow speed of the muddy water flowing from top to bottom in the filler area is reduced at the water outlet hole 28 of the baffling cylinder 15, the muddy water is separated, the sludge continues to settle, and the sewage flows outside the baffling cylinder 15 from bottom to top to the overflow tank 8 and then is discharged from the water outlet pipe 19. When the sludge at the bottom of the tank body 14 needs to be discharged, the regulating valve I5 is closed, the regulating valve II 9 is opened, the air stripping pipe 11 is ventilated, and the sludge is discharged out of the tank body 14 along the sludge discharge pipe 13 through the air stripping principle.

The upper part of the mud lifting pipe 24 is also provided with an adjusting mechanism for adjusting the size of the sludge through hole 27, the adjusting mechanism comprises a movable sleeve 2, an adjusting bolt 1, an internal thread member 26 and a fixing plate 25, the movable sleeve 2 is matched with the mud lifting pipe 24 and sleeved on the periphery of the mud lifting pipe 24, the two fixing plates 25 are symmetrically arranged at the top of the mud lifting pipe 24 along the inner wall, the two internal thread members 26 are symmetrically arranged on the movable sleeve 2 corresponding to the fixing plates 25, the adjusting bolt 1 is installed in the internal thread member 26, the end part of the adjusting bolt is in contact with the fixing plates 25, the movable sleeve 2 is adjusted to move up and down along the mud lifting pipe 24 by screwing the adjusting bolt 1, and the size of the sludge through hole 27 is adjusted, so that the sludge flow area is adjusted.

The sludge passing holes 27 are a plurality of axial strip-shaped holes formed on the circumference of the upper part of the sludge lifting pipe 24; the opening degree of the axial strip-shaped hole is adjusted through the movable sleeve 2 sleeved at the top of the mud lifting pipe 24.

The mixing chute 18 is a cylindrical structure with a bottom plate provided with an opening matched with the outer diameter of the mud lifting pipe 24, is sleeved below the mud through hole 27 on the mud lifting pipe 24 through the opening and is connected with the mud lifting pipe 24 into an integral structure; the sludge raised through the sludge raising pipe 24 enters the mixing flow tank 18 through the sludge passing hole 27 to be mixed with the sewage flowing in through the water inlet pipe 4.

The water outlet holes 28 formed at the bottom of the baffling cylinder 15 are two rows of round holes, the diameter of each round hole is phi 20 mm-phi 25mm, the round holes are uniformly arranged along the circumferential direction, the center distance between the round holes is 150 mm-200 mm, the distance between the upper row of holes and the lower row of holes is 150 mm-200 mm, and the distance from the bottom edge of the baffling cylinder is 100 mm-150 mm. The flow speed of the mud and water flowing from top to bottom in the filling area is reduced at the water outlet hole 28, the mud and water are separated, the sludge is continuously settled, and the sewage flows to the deflection cylinder 15 from bottom to top and then flows to the overflow groove 8 and then is discharged from the water outlet pipe 19.

The cross section of the overflow groove 8 is of an L-shaped structure, the short edge end of the overflow groove is connected to the inner wall of the tank body 14, and the long edge end of the overflow groove is uniformly provided with V-shaped grooves along the circumference.

A conical diversion cone 16 is arranged below the mud lifting pipe 24 at the bottom of the tank body 14, so that the mud is guided along the diversion cone, and the mud can conveniently rise along the mud lifting pipe 24 when the equipment runs.

The bottom of a mud pipe 13 arranged in the tank body 14 is arranged at the upper part of the guide cone 16, and the height from the inner bottom of the tank body is 50-80 mm.

The upper part of the tank body 14 is cylindrical, and the bottom of the tank body is in an inverted conical frustum shape, so that the strong pressure resistance of the side surface of the tank body is ensured, meanwhile, the concentrated sedimentation of sludge at the bottom is ensured during operation, and the sludge backflow amount is ensured. The top of the tank body 14 is provided with an arc-shaped annular cover plate 20 which is connected through a locking bolt I6, a manhole diameter 21 is arranged on a central hole of the cover plate 20, and a manhole cover 23 is connected on the manhole cover through a locking bolt II 22.

In this example, the tank body 14, the tank cover 20, the guide cone 16, the mud lifting pipe 24, the movable sleeve 2, the baffle cylinder 15, the mixed flow groove 18 and the overflow groove 8 in the tank body 14 are made of PE or glass fiber reinforced plastic.

The upper part of the tank body 8 is cylindrical, and the bottom of the tank body is in an inverted cone frustum shape.

The combined filler in the embodiment is a hairy sheet-shaped combined filler which is an existing outsourcing product, is hung on a top plate of the deflection cylinder 15 and a ring plate of the support plate II 17, and is suspended in the space between the deflection cylinder 15 and the mud lifting pipe 24.

The working principle of the invention is as follows:

the device is buried equipment, the height of the manhole 21 can be adjusted according to the thickness of a frozen soil layer of an actual installation site, the manhole cover 23 is 100 mm-150 mm higher than the ground, the locking bolt II 22 is connected with the manhole 21 and the manhole cover 23, the manhole cover 23 is opened for adjusting or overhauling internal components, and if the buried depth of the tank body is limited, heat insulation measures can be taken outside the tank body.

Before the device runs, firstly, an operator adjusts the position of the movable sleeve 2 relative to the mud lifting pipe 24, the movable sleeve 2 moves up and down along the mud lifting pipe 24 by screwing in and out the adjusting screw 1, the water passing area of the axial strip-shaped hole is reduced or enlarged, and therefore the backflow amount entering the mixing groove 18 is controlled.

When the sewage treatment device is used for sewage treatment in work, the regulating valve I5 is opened, and the regulating valve II 9 is closed; sewage enters a tank body 14 from a water inlet pipe 5 and flows into a mixing tank 18, an air inlet pipe 7 is divided into two branches in the tank body, one branch is connected with an aeration pipe 3, the other branch is connected with an air stripping pipe 11, the aeration pipe 3 extends into the bottom of a sludge lifting cylinder 24, air enters the aeration pipe 3 through the air inlet pipe 7, the air rises along the sludge lifting cylinder 24 to drive sludge settled at the bottom of the tank body 14 to rise, the rising sludge enters the mixing tank 18 through a groove-shaped hole at the top of the sludge lifting cylinder 24, the sludge is mixed with the sewage entering the mixing tank 18, the mixed sewage overflows to a baffling cylinder 15 and flows downwards in the baffling cylinder 15 to contact and react with a combined filler 12; the sewage flowing from top to bottom in the deflection cylinder 15 decreases in flow speed at the circular hole part at the bottom of the deflection cylinder 15, sludge and water are separated, sludge continues to settle, and the sewage is deflected to the outside of the deflection cylinder 15, flows downwards and upwards to the overflow groove 8 and is discharged from the drain pipe 19. When the sludge at the bottom of the tank body 14 needs to be discharged, the regulating valve I5 is closed, the regulating valve II 9 is opened, the air stripping pipe 11 is ventilated, and the sludge is discharged out of the tank body 14 along the sludge discharge pipe 13 according to the air stripping principle.

It should be understood that the detailed description of the present invention is only for illustrating the present invention and is not limited by the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention can be modified or substituted equally to achieve the same technical effects; as long as the use requirements are met, the method is within the protection scope of the invention.

Claims

1. The utility model provides a little miniature sewage treatment plant of formula of burying which characterized in that: the sludge mixing and discharging tank comprises a tank body, a sludge lifting pipe arranged in the tank body, a deflection cylinder, a mixing tank, an overflow tank and combined fillers, wherein the lower part of the sludge lifting pipe is supported at the bottom of the tank body through a support plate II, a plurality of sludge through holes are formed along the circumference of the upper part of the sludge lifting pipe, the mixing tank is arranged at the lower part of the sludge through holes along the circumference of the sludge lifting pipe, the deflection cylinder is sleeved at the periphery of the sludge lifting pipe and supported on the inner wall of the tank body through a support plate I, and a plurality of water outlet holes are formed near the bottom of the deflection cylinder along the circumference; the sludge discharge device comprises a baffling cylinder, a sludge lifting pipe, an overflow groove, a sludge discharge pipe and a sludge discharge pipe, wherein suspended combined filler is filled between the baffling cylinder and the sludge lifting pipe; the aeration pipe and the gas stripping pipe are respectively provided with an adjusting valve, and sewage treatment or sludge discharge is respectively carried out by controlling the two adjusting valves to be alternately switched on and off; the tank body is provided with a water inlet pipe communicated with the mixing groove and a water outlet pipe communicated with the overflow groove.

2. The buried miniature sewage treatment plant according to claim 1, characterized in that: the mud lifting pipe is characterized in that an adjusting mechanism for adjusting the size of the sludge through holes is further arranged on the upper portion of the mud lifting pipe and comprises a movable sleeve, adjusting bolts, internal thread components and fixing plates, the movable sleeve is matched with the mud lifting pipe and sleeved on the periphery of the mud lifting pipe, the two fixing plates are symmetrically arranged on the top of the mud lifting pipe along the inner wall, the two internal thread components are symmetrically arranged on the movable sleeve corresponding to the fixing plates, the adjusting bolts are installed in the internal thread components, the end portions of the adjusting bolts are in contact with the fixing plates, the movable sleeve is adjusted to move up and down along the mud lifting pipe through screwing of the adjusting bolts, and the size of the sludge through holes is adjusted.

3. The buried miniature sewage treatment plant according to claim 1 or 2, characterized in that: the sludge through holes are a plurality of axial strip-shaped holes formed in the circumference of the upper part of the sludge lifting pipe.

4. The buried miniature sewage treatment plant according to claim 1, characterized in that: the mixing chute is a cylindrical structure with a bottom plate provided with an opening matched with the outer diameter of the mud lifting pipe, and the mixing chute and the mud lifting pipe are connected into a whole structure by sleeving the opening below the mud through hole on the mud lifting pipe.

5. The buried miniature sewage treatment plant according to claim 1, characterized in that: the bottom of the deflection cylinder is provided with two rows of water outlet holes, the distance between the upper row of holes and the lower row of holes is 150 mm-200 mm, and the distance from the bottom edge of the deflection cylinder is 100 mm-150 mm.

6. The buried miniature sewage treatment plant according to claim 1, characterized in that: the cross section of the overflow groove is of an L-shaped structure, the short edge end of the overflow groove is connected to the inner wall of the tank body, and the long edge end of the overflow groove is uniformly provided with V-shaped grooves along the circumference.

7. The buried miniature sewage treatment plant according to claim 1, characterized in that: a conical diversion cone is arranged below the mud lifting pipe at the bottom of the tank body.

8. The buried miniature sewage treatment plant according to claim 7, characterized in that: the bottom of a sludge discharge pipe arranged in the tank body is arranged at the upper part of the flow guide cone, and the height from the bottom of the tank body is 50-80 mm.

9. The buried miniature sewage treatment plant according to claim 1, characterized in that: the upper part of the tank body is cylindrical, the bottom of the tank body is in an inverted cone frustum shape, the top of the tank body is provided with a cover plate, and the cover plate is provided with a manhole diameter and a manhole cover.

10. The buried miniature sewage treatment plant according to claim 1, characterized in that: the tank body, the tank cover and the flow guide cone, the mud lifting pipe, the movable sleeve, the flow deflection cylinder, the mixing groove and the overflow groove in the tank body are all made of PE or glass fiber reinforced plastic materials.